Uttran, Lake in Stockholm County, Sweden

Uttran is a long, narrow lake stretching from Tumba/Uttran in the east past Rönninge to the Södertälje border in the west, shared by Botkyrka, Salem and Södertälje municipalities. It covers 2.37 square kilometres, lies 17.1 metres above sea level and reaches a depth of 16 metres. Its single outflow, at Utterkalven in the east, feeds Tumbaån towards Kvarnsjön and Tullingesjön.

The name Uttran appears in documents from the 1550s as Vterlången, referring to otters once found in the lake. The lake has only one outflow, at Utterkalven in the east, from where water runs via Tumbaån to Kvarnsjön and Tullingesjön. Garnuddens nature reserve, Salem Municipality's first municipal reserve, was established in 2010, and Ensta ö nature reserve was created in 1997.

The name Uttran comes from the otters (utter) once found in the lake; it appears in documents from the 1550s as Vterlången. Otters are gone, but mink have been reported in the eastern part. The lake is fished by Rönninge and Uttran fishing conservation associations.

Children and teenagers under 17 can fish without a license, while adults need permits obtained through local fishing organizations. The clear water and accessible shoreline make this a good spot for relaxation and water activities.

Uttran has a single outflow at Utterkalven in its eastern end, separated from the main body by a narrow strait. From there the water runs through Tumbaån to Kvarnsjön and Tullingesjön, reaching the sea after 28 km and two watercourses. The name appears in 1550s documents as Vterlången, after the otters once found here; mink now occupy the eastern part.